Process for treating emery wheels



Patented Nov. 1 2, 1929 CHARLES L. ennnnron, orrone ISLAND CITY,

NEW YORK.

PROCESS FOR TREATING EMERY WHEELS No Drawing.

My invention relates to emery wheels of the type which are impregnated with rosin which acts as a lubricant in the wearing down of the wheel.

At the present time emery wheels are impregnated with rosin in the following manner. The emery wheel is heated to about 400 to 450 F. It is then taken from the oven and put into a molten bath of rosin immediately after which it is transferred into another oven of the same temperature asthe rosin which is about 400 F. This oven is allowed to gradually cool at room temperature.

The emery wheels produced by this process are very fragile and cause much trouble in use. I have found that this objectionable quality is the result of sudden changes of temperature to which the emery wheel is subjected in changing it from one oven to another.

It is a particular object of my invention therefore to provide a process for impregnating emery wheels with rosin in which the emery wheel will not be put under internal strain by sudden changes of temperature. I

accomplish this ob ect by placing an emery wheel in a flat position on a platform or car at atmospheric temperature. On top of the emery wheelI spread a layer of rosin commensurate with the size of the wheel. This layer of rosin may be in a prefer to use a disc of rosin of the same slze as the wheel. This disc may be formed by melting and molding the rosin and allowing it to cool. The platform or car containing the emery wheel with its layer of rosin on top is moved into an ture is gradually raised to above. the melting point of the rosin, preferably to 400 to 500 F. At this temperature trate the emery wheel which is porous. The oven is maintained at this temperature until the wheel is thoroughly impregnated with rosin after which the temperature is gradually reduced to room temperature.

As can be seen, the emery wheel is subjected to no sudden changes of temperature in this process. t is thoroughly impregnated with rosin and has a durability which exceeds any obtainable according Application filed July 17, 1928.

loose state but I' oven where the temperathe rosin will pene- P to the known processes. 7

Serial No. 293,490.

Moreover, this process is much shorter and much less expensive than the known processes.

Having thus described my invention, what I claim as new and desire to protect by Letters Patent is 1. The process for impregnating emery wheels with rosin comprising the steps of placing a layer of rosin on an emery wheel at ordinary temperatures, heating the two to a temperature above the melting point of rosin, maintaining the temperature at this point until the rosin penetrates the emery wheel and allowing the wheel to gradually cool.

2. The process for impregnating emery wheels with ros1n comprising the steps of superimposing a disc of rosin of the same diameter as theemery wheel on an emery wheel at ordinary temperatures, heating the two to a temperature above the melting point of rosin, maintaining the temperature at this point until the rosin penetrates the emery wheel and allowing the wheel to gradually cool.

3. The process for impregnating emery wheels with rosin comprising the steps of placing a layer of rosin onjan emery wheel at ordinary temperatures, heating the two to a temperature of from about 400 to 500. F., maintaining the temperature at this point until the rosin penetrates the emery wheel and allowing the wheel to gradually cool.

4. The process for impregnating emery wheels with rosin comprising the stepsof superimposing a disc of rosin of the same diameter as the emery wheel on an emery. wheel .at ordinary temperatures, heating the two to a temperature of from about 400 to 500 F.,' maintaining the temperature at this oint until the rosin penetrates the emery wheel and allowing the wheelto gradually .coo

In testimony whereof I have hereunto setmy hand.

' CHARLES L. GEHNRICH 

